Corporate public relations and advertising are not only regularly criticized by intellectuals, scientists and writers, but also by cultural and artistic institutions and practitioners. Themselves using advertising and public relations approaches their products are artistic pieces and also caricature the advertising and public relations industry.
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David Kahn can be considered one of the most important historians on cryptography. His book The Codebreakers. The comprehensive history of secret Communication from Ancient Times to the Internet, written in 1996 is supposed to be the most important work on the history of cryptography.